<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
    <style>
        .one {
            width: 100px;
            height: 100px;
            background-color: yellow;
        }

        .two {
            width: 200px;
            height: 200px;
            background-color: yellowgreen;
        }

        .three {
            width: 300px;
            height: 300px;
            background-color: rgb(0, 8, 255);
        }
        .active{
            color: red;
        }
    </style>
</head>

<body>
    <div id="app">
        <div :class="['one','two','three']"></div>

      <div class="public" :class="boxClass"></div>
    </div>
    <script>
        const vm = new Vue({
            el: "#app",
            data() {
                return {
                   boxClass:["one","two","three"]
                }
            }
        })
    </script>
</body>

</html>